There are voices in this game. Nomura said they were trying to put in as many voices as possible in an early interview. Unfortunately I don't have a link to confirm this, so you can choose not to believe me if you want. If SE doesn't spend money on a 256MB card this time, they'll look even more cheap than they already are.

As for that screen where Roxas is floating, I think it is a "bug". Clearly Roxas' model isn't exactly level with the ground. Not very noticeable though. The screen looks like it might be shown during the beginning of a boss fight or something.